Electrically-controlled skip-hoist.



No. 844,662. PATENTED FEB. 19, 1907.

H. H. CUTLER. BLBGTRIGALLY CONTROLLED SKIP HOIST.

APPLICATION FILED JULY 20,.1904.

2 SHEETS-SHEET 1.

PATENTED FEB. l9, 1907.

H. H. CUTLER.

ELEOTRIOALLY CONTROLLED SKIP HOIST.

APPLICATION FILED JULX20,1904.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

HENRY H. CUTLER, OF MIINVAUKEE, WISCONSIN, ASSIGNOR TO THE CUT-LERHAMMER MANUFACTURING COMPANY, OF MILWAUKEE, I/VISCON- SIN, ACORPORATION OF \VISCON SIN.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed July 20, 1904. Serial No. 217,418.

To all whom, it may (Jo/worn:

Be it known. that I, HENRY H. CUTLER, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented new and useful Improvements inElectrically-Controlled Skip-Hoists, of which the following is a full,clear, concise, and exact description, reference being had to theaccompanying drawings, forming a part of this specification.

My invention relates to means for automatically stopping load-carryingdevices in approximately the same position irrespec tive of the loadwhich the machine may be carrying at the time.

It is particularly applicable to skip-hoists, ingot-buggies, travelingcranes, Sac.

For the purpose of illustration I have shown my invention as applied tothe operating machinery of a skip-hoist, preferably driven by anelectric motor. In using a skip-hoist in rolling-mills for carrying ore,coke, and other material to the top of the cupola or steel-converters ifthe skip runs over, it will fall into the hopper of the furnace andcause considerable damage. On the other hand, if'it stops too soon itcannot dump its load. It is of great importance, therefore, to stop thesame at exactly the same spot at every trip, irrespective of the weightof the load being carried. The variation on the load of a skip-hoist, asthe skiphoist is adapted to carry coke, which is extremely light, oriron ore, which is extremely heavy, makes it impracticable to rely uponany friction devices for accurately stopping the skip at the properpoint.

To accomplish the object of my invention, I automatically slow down thespeed of the skip before the same reaches its final stopping place,thereby destroying the momentum of the skip and permitting the same tobe stopped. by means of the ordinary type of frictionbrake.

In the drawings showing the application of my invention to a skip-hoist,Figure 1 is a plan view of my device. Fig. 2 is a partial sectional viewof the magnetic clutch employed in connection with my deivce. Fig. 3

is a face view thereof, and Fig. 4 is a diagrammatic view of thecircuits employed.

In the drawings I have shown a motor 1 for driving a skiphoist, havingkeyed to the shaft thereof a small pinion 2. Also secured upon the shaftof the motor is the field of a single magnetic clutch 3, comprising aback plate 4, integrally formed with a hub 5, suitably keyed upon theshaft of the armature member of the motor. To the back plate 4 aresecured a pair of rings 6 and 7, the ring 6 carrying inwardly-extendingpolar projections 8 and the ring 7 carrying outwardly extending polarprojections 9, the two sets of poles being arranged in overlappingpositions and held in position against the back plate 4 by bolts orscrews 10. The spaces between the pole-pieces are filled withnon-magnetic material 11, which may be Babbitt metal or other equivalentmaterial.

An annular channel is provided in the face of the back plate 1, and therings 6 and 7 when placed together form in conjunction therewith anannular channel for the reception of the annular winding 12 of theclutch.

Suitably journaled in the independent bearings 13 and 14 is anindependent shaft 15 in alinement with the shaft of the motor, and keyedupon said shaft 15 is an annular armature member 16. The armature member16 is of annular form and secured to the outer periphery of aspring-disk 18, the inner face of which is secured to a flange 19 uponthe hub 20, keyed to the shaft 15. A magnet member 17 is loosely mountedupon the shaft 15 and has formed on the outer periphery thereofgear-teeth The magnet member 17 is of the same general construction asthe magnet member 3 and is provided. with an energizing-winding 21. Uponthe opposite end of the shaft 15 is keyed a pinion 23 and a brake-wheel24-, which is adapted to be engaged by an electrically-controlledfriction-brakc 25. A gear-wheel 26, keyed upon a jack-shaft 27, suitablymounted in journals 28 and 29, is adapted to mesh with the pinion 2. Apinion 30, also keyed upon the jackshaft 27, meshes with the gear-teeth22, formed on the outer periphery of the magnet member 17, and agear-wheel 31, mounted upon a shaft 32, ournaled. in the bearings 29 and33, meshes with the pinion 23. The winding-drum 34 is mounted upon ashaft suitably journaled in the journals 35 35 and has secured thereto agear-wheel 36, which is adapted to mesh with a pinion 37, mounted uponthe shaft 32.

In operating the device it will be seen that if current be admitted tothe energizingwinding 21 the magnet member 1.7 will be attracted to thearmature 16 and motion will be transmitted from the motor through thepinion 2 and gear 26, driving the shaft 27,

through the pinion meshing with the gearteeth 22. The pinion 23 willthus be caused to operate, and through it the shaft 32, driv ing thewinding-drum 31 through the pinion 37 and gear 36 at a greatly-reducedspeed. On the other hand, if the magnet member 12 be energized. theshaft 15 will be driven '11 11- out the intervention of the gear 26 andpinion 30 at a much higher speed, thereby increasing the speed of thewinding-drum.

In Fig. 1 I have illustrated the electric circuits and apparatus forcontrolling my device. A hand-operated switch having the lever 38, whichcarries a brush 39, is provided for controlling the motor and therespective clutches. The operators switch is so designed that when theskip approaches the limit of its travel the traveling nut mechanism 10,which is connected by a chain 11 with the wimling-drum, engages with oneof the atljt1stingtlogs 12 or 13, so as to deencrgize the high-speedclutch and energize the slowspeed clutch. The further operation of theseoperating-dogs will appear hereinafter. Contacts +11, 15, 16, and 47control the circuit to the solenoid-switches 4S and 19, which con trolthe operation of the high-speed and slowspeed clutches, respectively.The contacts 50 and 51 control the circuits through the solenoidswitchcs52 and 53, which. control the operation of the motor. A contact 54 isconnected directly with one side of the circuit, whereby the circuit maybe closed through the respective parts by the brush 39 making contactwith the several contacts on the switch. A solenoid-magnet operates apivoted lever 56, whose operation is controlled by the d ash-pot 57 toclose the circuit to the several solenoid-switches 58, 59,60, and 61,which cut in and out the resistance 62 in the circuit of the motor 1,which is of the usual type, having a shunt field-winding 63 and a series-lield 61. A brake-solenoid 65 is connected in series with the windings12 and 21 of the magnetic clutches 3 and 17.

In operation let it be assumed that the lever 35 has been moved to theposition shown in the drawings, in which case the traveling nut 10 willengage the dog 18 and prevent the lever from being moved to the right,permitting the same, however, to be moved farther to the left. ll iththe lever 38 in the position shown circuit will be closed through thesolenoid-switch 52, the circuit being traced from the main 67 across theswitch 68, through conductors 69 and 70 to the contact 51', across thebrush 39 to contact 50, con- 1 main 75.

l l l l l i l l 1 l l 1 r l r connected with the comluctor 88.

oid-switch 52, conductor 72, across the switch 73, which is heldnormally closed by the lever 56, and through conductor 71 to the Thisenergizes the winding of the solenoid-switch and causes the plate 76,

1 carried on the core thereof, to bridge the conwhich in turn willoperate the shaft 15 tacts 77 and 78 and the plate 79, carried on theupper end of the core of the solenoid, to bridge tl e contacts 80 andS1. The circuit is then closed through the solenoid-winding 55 and maybetraced over conductors 82 and to the hub of the lever 56, thence by conductor 84, across the switch S5, conductor 86, through thesolcnoid-wimling, thence by conductors 87, 8S, and S9 to the contact 81,across the contactplate 79 to contact 80, and thence by conductor 71 tothe opposite main 75. A second circuit may also be traced from thecontact 78 through conductor to the armature of the motor and thence byconductor 91, through the resistance 62, conductor 89, to contact 81,across the contact-plate 79, to contact 80, and thence to the oppositemain 75 by conductor 71. This starts the motor to operate with allresistance in. circuit; but the solenoid 55 being energized its corewill move the switch-arm over a series of contacts 92, 93, 91, 95, and96 to close the circuit through the energizingwindings 58, 59, 60, and61, respectively, which have one terminal of their windings respectivelyconnected. with the contacts 92, 95, 91-, and 95 by conductors 97, 98,99, and 100, their opposite terminals being connected with the conductor88. The solenoidswitches 58, 59, 60, and 61 are provided withcontact-plates 101, 1.02, 103, and 101 to bridge the contacts 105 106107 1.08 109 110 111 112. The contact 112 is connected with one end ofthe resistance 62, and the contact 111 is connected with the conductor88. The contact 110 is connected with a section of the resistance 62,while the contact 109 is The contacts 108 and 106 are respectivelyconnected with sections of resistance, while the contacts 107 and 105are respectively connected with the conductors S8 and 89. It will thusbe seen that as each solenoid-winding is energized, thereby bridging thepairs of contacts, they will serve to cut out a section of theresistance. in the motm-circuit.

The core of the solenoid-winding 61 carries at its top a contact-plate113, which bridges the contacts 111 and 1.15, thereby ductor 71, throughthe winding of the solen- 1 38 is moved farther to the left the circuitthrough the solenoid-switch 49 is closed, circuit being traced from themain 67, through conductors 69 and 70, contact 54, brush 39, contact 45,conductor 116, switch 117, conductor 118, through the winding of thesolenoid. 49, conductor 119, contact 115, plate 1133, contact 114,conductor 120, conductor 74, to the opposite main 75. This energizes thewinding of the solenoid and causes the plate 121 to make contact withthe contactpoints 122 and 123, thereby closing the circuit through thewindings of the slowspeed clutch 17, the circuit being traced from themain 67, through the conductor 69, conductor 124, across thecontact-plate 121, conductor 125, through the windings 21, conductor125, through the winding of the solenoid-brake, thereby releasing saidbrake and conductor 126, back to the main 75. The skip is thus started,moving on the slowspeed gear, and as the lever is moved farther to theleft the brush makes contact with the contact-plate 44, thereby openingthe circuit through the slow-speed side of the clutch and closing thecircuit through the winding of the solenoid 48, the circuit being tracedfrom the main 67, conductor 68, conductor 69, conductor 70,contact-plate 54, brush 39, contact-plate 44, conductor 1.27, switch128, conductor 129, through the winding of the solenoid 48 to conductor119, and thence, as previously traced, back to the opposite main 75. Thewinding of the solenoid 48 being energized, the core thereof will beattracted, and the contact-plate 130 will bridge the contacts 131 and132, thereby closing the circuit from the main 67 through conductor 69,conductor 133, contact-plate 130, conductor 134, through the windings12, conductor 125, through the winding of the solenoid-brake 65,conductor 126, to the opposite side of the circuit. In this way thewinding 12 is energized, and. the skip will run at its highest speed.

When the skip approaches the limit of its travel, the traveling nut 40will engage the dog 42, causing the switch-lever to be moved in anopposite direction, thereby first deenergizing the high-speed clutch andenergizing the slow-speed. clutch, bringing the speed of the skip downto such a degree that when the slow speed clutch is finally deenergizedby a further movement of the lever 38 and the friction-brake permittedto operate the skip may be readily stopped without danger of its runningover and falling into the hopper. The same movement of the lever whichfinally deenergizes the clutch may be continued to the right far enoughso that the brush 39 will make contact with the contact-plate 51,starting the motor in a reverse direction, circuit being closed from themain through the conductors 69 and 70, contact-plate 54, contactplate51, conductor 135, through the wind- 1 ing of the solenoid 53, andthence by conductors 72 and 74 to the opposite main 1 75. This energizesthe winding of the solenoid 53 and causes the plates 130 and 137 to makecontact with the contact-points 138, 139, 140, and 141, respectively,thereby closing the circuit through the motor in an opposite directionand causing the same to reverse. A further movement of the lever to theright will energize the high and slow speed sides of the clutch,respectively, and the skip will be returned to a position for loadingagain. In this manner the motor its contents and'have attained fullspeed in a reverse direction before the skip is started in an oppositedirection.

l Having described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The combination with a driving mechanism, of a driven mechanism, aclutch for connecting the same having a member driven at a relativelyslow speed and a member driven in the same direction at a relativelyhigh speed, a member adapted to engage either of said members, andautomaticallyoperated. means for causing the operation of the drivenmechanism through said high- 2. The combination with a drivingmechanism, of a driven mechanism, a clutch having a member drivenat arelatively high speed and a member driven in the same direction at arelatively low speed, autoi'natically-operated means for causing theoperation of said driving mechanism through said high-speed and.low-speed members re spectively, and means to stop the driven mechanismat a predetermined point.

3. The combination with a driving mechanism, of a magnetic clutch toconnect the same with the machinery to be driven, said clutch havingparts connected with said driving mechanism and adapted to be driven inthe same direction at difi'erent speeds, and a part connected with thedriven machinery and adapted to engage either of said firstmentionedparts, and automatically-operated means to cause said engagement.

4. The combination with a driving mechanism, o'l a magnetic clutch toconnect the same with the machinery to be driven, said clutch havingparts geared to the driven. mechanism and driven in the same direction'at di'fi erent speeds and a part geared to the machinery to be drivenand adapted to engage either of said first-mentioned parts, andautomatically-operated means to cause said engagement.

5. The combination with a driving mech anism, of? a magnetic clutch toconnect the same with the machinery to be driven, said clutch having twomembers connected with the driven mechanism and driven in the may bereversed while the skip is unloading speed and low-speed membersrespectively. 9 5

IOCI

same direction at different speeds and a third menber connected with themachinery to be driven and adapted to engage either and electromagneticmeans for operating said movable element.

a resistance therefor, a plurality of electro magnets adapted to besuccessively energized to remove said resistance from circuit step bystep, a movable element for successively closing the circuit of saidelectromagnets, and an electromagnet for operating said movable element.

8. In combination, an electric motor, a resistance therefor, a pluralityof electronmgnets adapted to be successively energized to remove saidresistance from circuit step by step, a movable element for successivelyincluding said electroniagnets in circuit, an electromagnet foroperating said movable element, and a magnetically-operated switch forclosing the circuit through said last-mentioned clectromagnet.

9. In combination, an electric motor and a resistance therefor, aplurality of electro magnets adapted to be successively energized toremove said resistance from circuit step by step, a movable element forsuccessively closing the circuit of said electroinagnets, anelectromagnet for operating said movable element, and means for closingthe circuit through the armature of the motor and through saidlast-mentioned eleetroiiiagnet.

10. In combination, an electric motor and a resistance therefor, aplurality of electro magnets adapted to be successively energized toremove said resistance from circuit step, by step, a movable element forsuccessively including said electi'oniagnets in circuit, anelectromagnet for operating said movable element, and amagnetically-operated switch for closing the circuit through thearmature of the motor and through said last-mentioned electromagnet.

11. In combination, an electric motor and a resistance therefor, aplurality of electromagnets adapted to be successively energized toremove said resistance from circuit, step by step, a movable element forsuccessively electromagnet for operating said movable element, and apair of inagiietically-operated switches for controlling the circuitthrough said motor, and through said secondmentioiied electromagnet.

12. In combination, an electric motor, and

l i l said clutch until all of the resi renmved from the motor-circuit.

a resistance therefor, a plurality of electromagiiets adapted to besuccessively energized to remove said resistance from circuit step bystep, a movable element for successively including said electromagnetsin circuit, a niagneticallyoperated switch for controlling the circuitthrough the motor in one direction, a second magnetically-operatedswitch for controlling the circuit through the motor in an oppositedirection, said switches being also adapted to control the circuitthrough said electromagnet.

13. In combination, an electric motor and t a resistance therefor, aplurality of electro- 7. In combination, an electric motor, and

magnets adapted to be successively energized to remove said resistancefrom circuit step by step, a movable element for successively includingsaid electromagnets in circuit, a pair of magnetieally-operated switchesfor controlling the circuit through the motor, and through saidsecond-mentioneil electromagnet, and a switch for controlling thecircuit through the magnets of said magnetic switches.

14-. In combination, an electric motor and a resistance therefor, aplurality of electromagnets adapted to be successively energized toremove said resistance from circuit step by step, a .movable element forsuccessively including said electromagnets in circuit, a pair ofelectromagiietically-operated switches for controlling the circuitthrough the motor. and through said second-nientioned electromagnet, andan automati 'ally operated switch for controlling the circuit throughthe magnets of said magnetically operated switches 15. In combination,an electric motor, and a resistance therefor, a magnetic clutch, aplurality of clectromagnets adapted to be successively energized toremove said resistance from circuit step by step, and means to preventthe closing of tire circuit through said clutch until all of theresistance has been removed from the motor-circuit.

16. In combination, an electric motor and a resistance therefor, amagnetic clutch, a plurality of electromagnets adapted to besuccessively energized, to remove said resistance from circuit step bystep, and means controlled by one of said electromagnets to prevent theclosing of the circuit through fiance has been 17. In combination, anelectric motor and a resistance therefor, a plurality of magneticclutches, a plurality of electromagncts adapted to be successivelyenergized to remove including said electromagnets in circuit, an, 1

said resistance from circuit step by step, a movable element forsuccessively including said electromagnets in circuit, and means forpreventing the closing of the ci cuit to said clutches until all of theresistance has been 1 removed from the motor-circuit.

18. In combination. an electric motor and a resistance therefor, aplurality of magnetic clutches, a plurality of electromagnets adapted tobe successively energized to remove said resistance from circuit, stepby step, a movable element for successively including saidelectromagnets in circuit, and means operated by one of saidelectromagnets for preventing the closing of the circuit to saidclutches until all the resistance has been re moved from themotor-circuit.

19. In combination, an electric motor and a resistance therefor, amagnetic clutch, a plurality of electromagnets adapted to besuccessively energized to remove said resistance from circuit step bystep, and a switch controlling the circuit through said clutch andadapted to be closed only after all of the resistance has been removedfrom the motor-circuit.

20. In combination, an electric motor and a resistance therefor, amagnetic clutch, a plurality of electromagnets adapted to besuccessively energized to remove said resistance from circuit step bystep, a switch controlling the circuit through said clutch, and adaptedto be closed by the last of said electromagnets, whereby the circuitthrough the clutch will not be closed until all of the resistance hasbeen removed from the motorcircuit.

21.. In combination, an electric motor and a resistance therefor, aplurality of magnetic clutches, a plurality of electromagnets adapted tobe successively energized to remove said resistance from circuit step bystep, a movable element for successively inc uding said electromagnet incircuit, a switch controlling the circuit to said clutches and adaptedto be operated only when all of the resistance has been removed from themotorcircuit.

22. In combination, an electric motel and a resistance therefor, aplurality of magnetic clutches, a plurality of electromagnets adapted tobe successively energized to remove said resistance from circuit step bystep, a movable element for successively including said electromagnetsin circuit, and a switch controlling the 0' en t through said 0 utchesand adapted to be operated by the last of said electromagnets, wherebythe circuit to said. clutches will not be closed until all of theresistance has been removed from the motorcircuit.

3. In combination, an electric motor, and a resistance therefor, amagnetic clutch, a plurality of electromagnets adapted to besuccessively energized to remove said resistance from circuit step bystep, a movable ele ment for successively including said electromagnetsin circuit, a magnetically-operated switch for controlling the circuitthrough said clutch, and an automatically-operated switch for operatingthe circuit through the magnet of said magnetically-operated switch.

24. In combination, an electric motor and a resistance therefor, aplurality of electromagnets adapted to be successively energized toremove the said resistance from circuit step by step, a plurality ofmagnetic clutches, a plurality of 1nagnetically-operated switches forcontrolling the circuit to said clutches, and an automatically-operatedswitch for controlling the circuit through the magnets of saidmagnetically-operated switches.

25. I11 combination, an electric motor and a resistance therefor, aplurality of electromagnets adapted to be successively energized toremove said resistance from circuit step by step, a movable element forsuccessively including said electromagnets in circuit, a pluralit-y ofmagnetic clutches, a plurality of magnetically-operated switches forcontrolling the circuit through said clutches, means for preventing theclosing of the circuit through said clutches before all of theresistance has been removed from the motorcir cuit, and a switch forcontrolling the circuit through the magnets of said magneticallyoperatedswitches.

26. In combination, an electric motor and a resistance therefor, aplurality of electromagnets adapted to be successively energized toremove said resistance from circuit step by step, a movable element forsuccessively including said electromagnets in circuit, a plurality ofmagnetic clutches, a plurality of magnetically-operated switchescontrolling the circuit through said clutches, means operated by one ofsaid electromagnets for preventing the closing of the circuit throughsaid clutches before all of the resistance has been removed from thecircuit, and a switch for controlling the circuit through the magnets ofsaid magnetically-operated switches.

27. In combination, a motor and a resistance therefor, a plurality ofelectromagnets adapted to be successively energized to remove saidresistance from circuit step by step, a movable element for successivelyin cluding said resistance in circuit, an electromagnet for controllingsaid movable element, a plurality of electromagnetic switches forcontrolling the circuit through the motor and through saidelectromagnet, a plurality of magnetic clutches,- a plurality ofelectromagnetic switches controlling the circuit through said clutches,and a switch for controlling the circuit through said motor-controllingswitches and through said clutch controlled switches.

28. In combination, an electric motor and a resistance therefor, aplurality of electro magnets adapted to be successively included incircuit to remove said resistance step by step, a movable element forsuccessively including said electromagnets in circuit, a plurality ofmagnetically-operated switches for IEO sistztnee of said motor has beenremoved from said circuit.

In Witness whereof I have hereunto subscribed my name in the presence oftwo Witcontrolling the circuit through said motor, and through saideieetroiuztgnet, a plurality of magnetic chuehes, a plurality ofmagnetic switches for conrroiiilig the circuit through said clutches, a.switch for controi'tiug the eir- I uesscs.

ouit through said motor-conrrolling switches,

and said cltuch-colitroliiug switehes, and 3 means operated by one ofsaid resistanee-opi Witnesses: ermiug eieetrouutgnets for preventing the0p- 1 FREDERIC S. WILIIoiT, to erzuiou of said clutches before all ofthe re 1 NORMAN C. BASSETT.

HENRY H. CUTLER.

